Fission mailed metal gear solid

I think there may be some confusion here!

Fission is not a character from Metal Gear Solid, and Metal Gear Solid is not a metal band.

However, I think you might be referring to Solid Snake, the main protagonist of the Metal Gear Solid series. Solid Snake is a fictional character in the Metal Gear series of video games, created by Hideo Kojima.

If you're thinking of a specific song or album with a similar title, could you please provide more context or information about what you're looking for? I'd be happy to help you identify the correct information!